Peep-sight for twyer-stocks.



PATENTED MAR. 12, 1907.

s. HOSKING. PEEP SIGHT FOR TWYER STOCKS.

APPLICATION FILED NOV 8 1906 WITNESSES UNITED STATES PATENT OFFICE.

SETH HOSKING, OF WHEELING, WEST VIRGINIA, ASSIGNOR' TO NATIONAL TUBE COMPANY, OF PITTSBURG, PENNSYLVANIA, ACORPORATION OF NEW 7 PEEP-SIGHT FOB 'rwYEn s'roc s.

Specification of Letters Patent;

Patentedlarch 12, 1907.

To all whom; it may concern:

Be it known that I, SETH HOSKING, of Wheeling, Ohio county, West Virginia, have invented a new and useful Improvement in Peep-flights for Twyer-Stocks, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, forming a part of this specification, in which Figure 1 is a front elevation of a flange for a twyer-stock provided with my improvement; and Fig. 2 is a sectional view on the line II II of Fig. 1, showing the improved peep-sight in place on the branch of the furnace twyer-stock.

My invention relates to apparatus used in connection with blast-furnaces, and it partic ularly relates to the ap aratus used on the blast-furnace twyer-stoc s by which the condition of the interior of the furnaces is observed.

The object of my invention is to provide improved means for attaching the peepsights to the tWyer-stocks and means for securing the glass used with the peep-sights so that they can be easily and quickly removed and re laced.

It a so consists in the novel construction and arrangement of the parts, in the use of which the glass in the peep-sight may be cleaned and any dust or other obstructions in front of the glass in the peep-sights can be readily removed.

A further ob'ect of my invention is to provide improved means whereby leakage of the blast through the peep-sight connections is prevented and in providin means by the use of which the plug in which the glass of the pee -sight is secured can be removed and replace without the necessity of stoppin the operation of the furnace by shutting o theblastp- In the drawings, 2 represents the flange on one of the twyer-stocks, this flange, as shown, being secured to the flanged branch 3 of the twyer-stock by means of the bolts 4 and 5.

A gasket 6, of asbestos or other suitable matenal, is placed between the faces of the flange and branch. The flange 2 is provided with an outwardly-extending lug 0r boss 7, and an opening 8, through which the interior of the furnace is seen, extends through both the flange 2 and boss 7, The boss 7 is also through the opening 7, car

.tion of thefurnace.

provided with an opening 9, having its axis perpendicular tothat of the opening 8. The

openin 8 is tapered, and a correspondingly.

tapere plug 10 is fitted into the opening 9. The plug 10 is also provided with an opening 11, having a recessed portion 11, into which a circular glass 12 is fitted, this glass bein retained in place by means of the threade ring or collar 13, which is screwed into the recess 11* this recess being provided with corresponding threads. To facilitate the removal and replacing of this collar, it is provided with the slots 14, into which a screwdriver or other tool is inserted.

When the parts are assembled as shown in the drawings, the condition of the interior .of the furnace in the vicinity of the different stocks dust or dirt carried by the blast is liable to settle in the openin s in the plug 10 and flange 2 and obstruct the ine of sight through the glass and twyer-stock. When this ocours and. it becomes necessary to remove these obstructions, this is accomplished by lifting the plug 10 from its seat in the boss and perniittingthe blast to blow outwardly with it the collected dirt or dust. When t e inner face of the glass 12 becomes obscured, the plug 12 is rotated so as to bring this surface outward,

when the glass may be wiped ofl or otherwise cleaned and the plug again turned in its seat into its former position. When for any reason it'becomes necessary to remove one of the plugs, this can be easily and quickly done by simply lifting the plug from its seat and replacing it by another.

The advantages of my invention will be apparent to those skilled in the art. The peep-sight can be readily cleaned, and the pl may be easily removed and replaced wit out the necessity of stopping the opera- By the use of the plug containing the glass ample surface can be provided to prevent the possibility of leakage through the joint made between surfaces of the lug and the opening in which it is placed.

odifications in the construction and loparting from my invention, since e hot blast is conducted to the furnace through the twyer- What I claim is- 1. A peep-sight for furnace lawyer-stocks comprislng a flange having a boss thereon, a taper opening through the boss, a plug extending through the taper openin an opening extending through the boss an flange, an opening through the plug, a glass centrally located lengthwise of the o ening in the pl said plug being adapted to erotated throug at least one hundred and eighty degrees in the taper openin ;substan'tia ly as described.

2. .peep-sig t for furnace twyer-stocks comprismg a flange having a boss thereon, a taper opening through the boss, a removable my hand.

SETH HOSKING. Witnesses Hnmzr B. N IcnoLs, Josnrn E. BROWN. 

